Alkali metal steam chamber with double layer structure

Abstract

The invention provides an alkali metal steam chamber with a double layer structure. The alkali metal steam chamber with a double layer structure includes an inner layer steam chamber and an outer protection air chamber, wherein the inner layer steam chamber is arranged in the outer protection air chamber, and is fixed together with the outer protection air chamber through a heat insulation supporting structure; a window of the inner layer steam chamber and a window of the outer protection air chamber are arranged coaxially to form a laser channel; the inner layer steam chamber is filled with buffer gas; and the outer protection air chamber is filled with protection gas. The alkali metal steam chamber utilizes the double layer structure to improve the integral sealing property of the alkali metal steam chamber, and isolates the inner layer steam chamber in the high temperature state from the outside through the outer protection air chamber, so that the requirement for the high temperature sealing property of the inner layer steam chamber is reduced and the available sealing structure types are widened. As the outer protection air chamber is under the non high temperature environment, fine air tightness can be maintained; and even small leakage occurs in the inner layer steam chamber, the leaked protection gas of the outer protection air chamber does not cause deterioration of the alkali metal in the inner layer steam chamber, so that the service life of the alkali metal steam chamber can be prolonged.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to an alkali metal vapor chamber with a double-layer structure. Background technique [0002] DPAL (Diode Pumped Alkali Vapor Laser) is a new type of optically pumped gas laser whose gain medium is alkali metal in vapor state. The temperature of the gain medium is usually 80-200°C. The gain medium of DPAL is mainly potassium, rubidium or cesium in the vapor state. Because of its advantages of high quantum efficiency, small thermal management problems, good beam quality and output laser wavelength in the atmospheric transmission window, it is considered to be in the field of high-power laser output. There are broader prospects. [0003] In the DPAL device, the vapor chamber is filled with a buffer gas for broadening of the D2 line absorption line and increasing the fine structure mixing rate. The currently commonly used manufacturing method of the steam chamber is to seal the cavity...

AI Technical Summary

Problems solved by technology

Moreover, once the steam chamber is heated or maintained at a high temperature, a little outside air will leak into it, which will cause the alkali metal in the steam chamber to deteriorate, which will lead to a short service life of the steam chamber made with this scheme.

Air leakage caused by uneven thermal expansion during heating will cause deterioration of alkali metal and affect its service life

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